MCQOPTIONS
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MCQOPTIONS
This section includes 29 Mcqs, each offering curated multiple-choice questions to sharpen your Hydraulic Machines knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
Pelton wheel is a Reaction type water turbine. |
| A. | True |
| B. | False |
| Answer» C. | |
| 2. |
The Pelton wheel extracts energy from________ |
| A. | Vane angle |
| B. | Moving fluid |
| C. | Increase in temperature |
| D. | Heat rejection |
| Answer» C. Increase in temperature | |
| 3. |
Before reaching the turbine, the acceleration of the fluid takes place through the__________ |
| A. | Vane angle |
| B. | Nozzle |
| C. | Pump |
| D. | Pipe |
| Answer» C. Pump | |
| 4. |
In an outward flow reaction turbine the discharge _______ |
| A. | Increases |
| B. | Decreases |
| C. | Same |
| D. | Independent |
| Answer» B. Decreases | |
| 5. |
In impulse turbines with stationary blades, there is_________ in blades of the turbine. |
| A. | Pressure change |
| B. | Same pressure |
| C. | Volumetric change |
| D. | Pressure independent |
| Answer» B. Same pressure | |
| 6. |
In impulse turbines with moving blades, there is no _________ in blades of the turbine. |
| A. | Pressure change |
| B. | Same pressure |
| C. | Volumetric change |
| D. | Pressure independent |
| Answer» B. Same pressure | |
| 7. |
A working fluid contains kinetic energy only. |
| A. | True |
| B. | False |
| Answer» C. | |
| 8. |
In an inward flow reaction turbine the discharge _______ |
| A. | Increases |
| B. | Decreases |
| C. | Same |
| D. | Independent |
| Answer» C. Same | |
| 9. |
Where is the turbine not used? |
| A. | Solar power |
| B. | Windmill |
| C. | Water wheels |
| D. | Gas plant |
| Answer» B. Windmill | |
| 10. |
Centrifugal flow is imparted when the__________ |
| A. | Reaction flow is negative |
| B. | Reaction flow is positive |
| C. | Efficiency is 100 percent |
| D. | Reaction rate is negligible |
| Answer» D. Reaction rate is negligible | |
| 11. |
Inward flow reaction turbine enter through ______ |
| A. | Outer periphery |
| B. | Blades |
| C. | Inner periphery |
| D. | Pressure angle |
| Answer» B. Blades | |
| 12. |
Turbine extracts energy from________ |
| A. | Reaction ratio |
| B. | Pressure ratio |
| C. | Fluid flow |
| D. | Volumetric ratio |
| Answer» D. Volumetric ratio | |
| 13. |
Turbine converts _________ |
| A. | Work to energy |
| B. | Energy to work |
| C. | Work to Electricity |
| D. | Work to pressure |
| Answer» C. Work to Electricity | |
| 14. |
A turbine is a ________ |
| A. | Rotary mechanical device |
| B. | Static pressure drop device |
| C. | Electrical device |
| D. | Static temperature device |
| Answer» B. Static pressure drop device | |
| 15. |
Degree of reaction for reaction turbine is _____________ |
| A. | 1- cot x /2(cot x –cot y) |
| B. | 1+ cot x /2(cot x –cot y) |
| C. | 1- cot x /2(cot x +cot y) |
| D. | 1+ cot x /2(cot x +cot y) |
| Answer» B. 1+ cot x /2(cot x –cot y) | |
| 16. |
The formula for degree of reaction for hydraulic turbines is __________ |
| A. | 1- (V1*V1-V2*V2)/(V1*V1-V2*V2)*(u1*u1-u2*u2)*(Vr2*Vr2-Vr1*Vr1) |
| B. | (V1*V1-V2*V2)/ (V1*V1-V2*V2)*(u1*u1-u2*u2)*(Vr2*Vr2-Vr1*Vr1) |
| C. | 1+ (V1*V1-V2*V2)/ (V1*V1-V2*V2)*(u1*u1-u2*u2)*(Vr2*Vr2-Vr1*Vr1) |
| D. | 1- (V2*V2-V1*V1)/ (V1*V1-V2*V2)*(u1*u1-u2*u2)*(Vr2*Vr2-Vr1*Vr1) |
| Answer» B. (V1*V1-V2*V2)/ (V1*V1-V2*V2)*(u1*u1-u2*u2)*(Vr2*Vr2-Vr1*Vr1) | |
| 17. |
Degree of reaction for impulse turbine |
| A. | 0 |
| B. | 1 |
| C. | 2 |
| D. | 3 |
| Answer» B. 1 | |
| 18. |
___________is ratio of pressure energy change inside runner to total energy change inside runner |
| A. | Degree of reaction |
| B. | Speed ratio |
| C. | Flow ratio |
| D. | Hydraulic efficiency |
| Answer» B. Speed ratio | |
| 19. |
An outward flow reaction turbine, ________ |
| A. | D1 > D2 |
| B. | D1 < D2 |
| C. | D1 = D2 |
| D. | D1 = D2 = 0 |
| Answer» C. D1 = D2 | |
| 20. |
An outward radial reaction turbine has ______ |
| A. | u1 < u2 |
| B. | u1 > u2 |
| C. | u1 = u2 |
| D. | u2 = u1 = 0 |
| Answer» B. u1 > u2 | |
| 21. |
Discharge in an outward flow reaction turbine ____________ |
| A. | Increases |
| B. | Decreases |
| C. | Remains constant |
| D. | Gradually decreases |
| Answer» B. Decreases | |
| 22. |
In an outward radial flow reaction turbine the ratio of tangential velocity at inlet to the given velocity is ______ |
| A. | Speed ratio |
| B. | Flow ratio |
| C. | Discharge |
| D. | Radial discharge |
| Answer» B. Flow ratio | |
| 23. |
In an outward radial flow reaction turbine the ratio of tangential wheel at inlet to given velocity of jet is known as ___________ |
| A. | Speed ratio |
| B. | Flow ratio |
| C. | Discharge |
| D. | Radial discharge |
| Answer» C. Discharge | |
| 24. |
In outward radial flow reaction turbines, tangential velocity at inlet is less than that of the outlet. |
| A. | False |
| B. | True |
| Answer» C. | |
| 25. |
___________ is a circular wheel on which a series of smooth, radial curved vanes are fixed. |
| A. | Guide wheel |
| B. | Runner |
| C. | Casing |
| D. | Draft tube |
| Answer» C. Casing | |
| 26. |
In general, reaction turbines consist of which types of energies? |
| A. | kinetic energy and potential energy |
| B. | potential energy and pressure energy |
| C. | kinetic energy and pressure energy |
| D. | gravitational energy and potential energy |
| Answer» D. gravitational energy and potential energy | |
| 27. |
If the water flows from inwards to outwards, the turbine is known as _____________ |
| A. | Tangential flow turbine |
| B. | Turbulent low inward flow |
| C. | Inward flow turbine |
| D. | Outward flow turbine |
| Answer» E. | |
| 28. |
The water from penstocks enters the _____ which is spiral in shape which the area of cross section of casing goes on decreasing gradually |
| A. | guide wheel |
| B. | draft tube |
| C. | casing |
| D. | runner |
| Answer» D. runner | |
| 29. |
In an outward flow reaction turbine, water from casing enters guiding wheel. |
| A. | True |
| B. | False |
| Answer» B. False | |